package com.java并发编程.cuncurrentUtil;

import java.util.concurrent.ConcurrentHashMap;

public class CuncurrentHashMapTest {
	
	public static void main(String[] args) {
		ConcurrentHashMap<String, String> cHashMap = new ConcurrentHashMap<>();
		cHashMap.put("1", "2");
//		cHashMap.put(null, "3");
		cHashMap.put("4", null);
	}

}
